<!DOCTYPE html>
<html lang="zh-cn">

<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <!-- <style>
    div {
      width: 200px;
      height: 200px;
      background-color: #d58512;
    }
  </style> -->
</head>

<body>
  <!-- <div></div> -->

  <script>
    setInterval(function(){
       document.body.style.backgroundColor ='#'+Math.random().toString(16).substr(2,6)
    }, 1000)

  </script>
</body>

</html>